。NET和ServicePointManager.SecurityProtocol

Question

我正在.net中使用webclient类，然后我下载了一个站点。

Dim oWebClient As New WebClient()
Dim oDownloadedPage As String = oWebClient.DownloadString(<site>)

经过一番搜索后，它抛出了一个验证错误，结果表明我尝试下载的站点必须禁用TLS1.0

因此我将ServicePointManger更改为此）>

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 Or 
   SecurityProtocolType.Tls12 Or SecurityProtocolType.Tls11 Or SecurityProtocolType.Tls
我遇到了同样的错误。所以我决定将其更改为此。。

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 Or 
   SecurityProtocolType.Tls Or SecurityProtocolType.Tls11 Or SecurityProtocolType.Tls12
看看我在那里做什么？我切换了订单，然后成功了。 

有人可以向我解释订购的区别是什么？为什么重要呢？我想知道是否要下载TLS 1.0站点，否则将失败。

我正在.net中使用webclient类，然后我下载了一个站点。昏暗的oWebClient作为新的WebClient（）昏暗的oDownloadedPage作为字符串= oWebClient.DownloadString（）抛出一个...

Answer 1

System.Net.ServicePointManager.SecurityProtocol = DirectCast(3072, System.Net.SecurityProtocolType) 'TLS 1.2
Dim inStream As StreamReader
Dim webRequest As WebRequest
Dim webresponse As WebResponse
Dim cResult As String = ""
webRequest = WebRequest.Create(CType(e.Argument, tSistemaRN).DDNS.Trim)
webresponse = webRequest.GetResponse()
inStream = New StreamReader(webresponse.GetResponseStream())
cResult = inStream.ReadToEnd()